NOTE: These composite estimates include out-of-scope shipments for sectors that are not included in Commodity Flow Survey (CFS) such as imports, logging, construction, retail, services, publishing, municipal solid waste, and household and business moves. They also include estimates of in-scope shipments for sectors that are covered in CFS but may have been underestimated due to small sample size, such as exports, intermodal, and petroleum products.

SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 2002 Commodity Flow Survey, United States Data, December 2004 plus sources for composite estimates listed in box B. The composite estimates were developed through a cooperative effort by the Bureau of Transportation Statistics and the Federal Highway Administration.